capacative sensing
capacative sensing
(OP)
posting for another engineer who is looking for techincal information on how capacative sensors work. Links to discussions, white papers or sites.
Thanks
Thanks
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RE: capacative sensing
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: capacative sensing
One of the toughest parts is getting the RC happy under a widely varying ambient and converting the generally non-linear RC into a linear result.
RE: capacative sensing
Gunnar Englund
www.gke.org
RE: capacative sensing
Wow that's a cheap keyboard!! How'd it work? Would you do it again? Why would water and dirt "break it" (should be distinguishable)? What sheeting did you use?? How much of a pain in the butt was production? Did the huge freakin 50/60hz on the finger confuse everything??? Huh Huh? Tell me!
RE: capacative sensing
The water and dirt could esily seep in under the protective film. I guess that this could be taken a lot further. First thing would be to use some adhesive between cover and PCB to seal off humidity.
Gunnar Englund
www.gke.org
RE: capacative sensing
Though maybe not, because the capacitive, (as apposed to the capacAtive method), allows no moving parts >-> failure. I have seen so many membrane keyboards take down industrial equipment!
RE: capacative sensing
What is needed is something that describes (white paper?) on contactless sensing using capacitive sensing. Itsmoked touched on it but need more detailed information if possible
RE: capacative sensing
The best you will find are touch sensor IC maker's data sheets. (last link below)
http://www.edn.com/article/CA498777.html
http://w
http://www.flashwebhost.com/circuit/touchcpo.php
http://
http://kitsrus.com/pdf/k137.pdf
http://www.qprox.com/products/qt1xxx.php
http: